Improved iiock



Cinitrri glatte' @aient @time ALEXANDER INGLIS, OF INDIANAPOLIS,INDIANA, ASSIGNOR T0 HIMSELE,v CHARLES W.`TYER, AND JOHN IN GLIS, OFSAME PLAGE.

Lette/rs Pct/tent No. 97 ,196, daterl'Nocember 23, 18`69f IMPROVED LOCK.

The Schedule referred to in these Letters Patent and making part of thesame To all whom it may concern:

`Be it known that I, ALEXANDER INcLrs, of Indianapolis, in the county ofMarion, and State of Indiana, have invented new and useful Improvementsin Locks; and `I do hereby declare that the following is a full, clear,and exact description thereof, that will.

toclose the outside key-hole, andl prevent the `insertion of keytherein.

Eigurel is a View of the interior of the lock, obtained by removing oneof the side-plates.

Figure 2 is a horizontal section on line :t 1, fig. 1.

Similar letters of reference indicate corresponding parts in the severalfigures.

A is the case, and B the/latch, constructed, arranged, and-operated inthe usual manner.

C is the bolt, made with three notches on its upper edge, with which thecatch i, of the tumbler D,'en

' gages,to hold the bolt, the' tum-bier being constructed and arrangedto operate in the usual manner.

The under side oil the bolt is also provided with three notches,arranged with reference to the two keyholes, g and 7L, the latter beingfor the outside, and in indicated in dotted lines.

A downward-priecting guard, I, is attached to or forms a part of thebolt, and is 'arranged so that when the bolt is thrust forward, by twiceturning the key, or double-locking it, the guard I is .brought oppositethe outside key-holen, thereby preventing the key from being insertedfrom the outside.

`When vthe bolt G. is thrust out bythe key, operated from the inside ofthe lo'ck but once, it may be operated from the outside, whether the keyis in the lock or not; but when it is desired to prevent the -lock from'being operated from the outside, the bolt is thrustfor ward twice,as'stated above. y

The form and construction of the several parts of the lock are such-thatfew pieces are required, and they are such as to be easily cast; hence,the lock cau be made in the cheapest. and simplest form.

Having thusvfully described my invention,

What I claim as new, and desire to secure by Letters '1)atent, is-

The combination, with the separate key-holes g aud 71., of' the-bolt C,with three notches ou its upper and lower edges, guard I, tumblerD, andspring f, whereby the bolt may be thrown out by one-turn of the insidekey, the door locked, and the outside key-hole left open, and by twoturns of said inside key, the outside key-hole may beclosed, allsubstantially as specitied. V

Witnesses: ALEXANDER INGLIS.

WM. H'. WEEKS, 0. F.' MAYHEW..

